docs: def update_oath_hotp_c(self, entry, new_c):
          """
          Update the OATH-HOTP counter value for `entry' in the database.
  
          Use SQL statement to ensure we only ever increase the counter.
          """
          key = entry.data["key"]
          c = self.conn.cursor()
          c.execute("UPDATE oath SET oath_c = ? WHERE key = ? AND ? > oath_c",
                    (new_c, key, new_c,))
          self.conn.commit()
          return c.rowcount == 1